[ssip]: Update YANG doc. (#11363)

- Why I did it
To implement Syslog Source IP feature

- How I did it
Added the relevant yang doc

- How to verify it
N/A

Signed-off-by: Nazarii Hnydyn <nazariig@nvidia.com>

src/sonic-yang-models/doc/Configuration.md

@@ -1099,33 +1099,51 @@ These information are configured in individual tables. Domain name or IP
 address of the server is used as object key. Currently there are no
 attributes in those objects.
 
-***NTP server***
-```
-{
-"NTP_SERVER": {
-        "2.debian.pool.ntp.org": {},
-        "1.debian.pool.ntp.org": {},
-        "3.debian.pool.ntp.org": {},
-        "0.debian.pool.ntp.org": {}
-    },
-
-"NTP_SERVER": {
-    "23.92.29.245": {},
-    "204.2.134.164": {}
-    }
-}
-```
-
-***Syslogserver***
-```
-{
-"SYSLOG_SERVER": {
-    "10.0.0.5": {},
-    "10.0.0.6": {},
-    "10.11.150.5": {}
-    }
-}
-```
+***NTP server***
+```
+{
+    "NTP_SERVER": {
+        "2.debian.pool.ntp.org": {},
+        "1.debian.pool.ntp.org": {},
+        "3.debian.pool.ntp.org": {},
+        "0.debian.pool.ntp.org": {}
+    },
+
+    "NTP_SERVER": {
+        "23.92.29.245": {},
+        "204.2.134.164": {}
+    }
+}
+```
+
+***Syslog server***
+```
+{
+    "SYSLOG_SERVER": {
+        "10.0.0.5": {},
+        "10.0.0.6": {},
+        "10.11.150.5": {}
+    },
+
+    "SYSLOG_SERVER" : {
+        "2.2.2.2": {
+            "source": "1.1.1.1",
+            "port": "514",
+            "vrf": "default"
+        },
+        "4.4.4.4": {
+            "source": "3.3.3.3",
+            "port": "514",
+            "vrf": "mgmt"
+        },
+        "2222::2222": {
+            "source": "1111::1111",
+            "port": "514",
+            "vrf": "Vrf-Data"
+        }
+    }
+}
+```
 
 ### Policer